linux-kernel - Re: Please pull arch perfmon update

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Date:	Mon, 13 Oct 2008 20:35:56 +0200
From:	Robert Richter <robert.richter@....com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-kernel@...r.kernel.org, oprofile-list@...ts.sourceforge.net,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Please pull arch perfmon update

On 30.09.08 01:52:53, Andi Kleen wrote:
> Robert,
> 
> Here are the arch perfmon changes ported to your latest oprofile tree.
> I didn't include the forcepmu=... change yet, that will come later.
> Right now the force option is just removed. Please pull.
> 
> Thanks,
> -Andi
> 
> The following changes since commit 22d87103484983035cf46891428819573ec7508d:
>   Robert Richter (1):
>         Merge branch 'oprofile/powerpc-for-paul' into oprofile/master
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc-2.6.git arch-perfmon2
> 
> Andi Kleen (4):
>       oprofile: drop const in num counters field
>       oprofile: Don't report Nehalem as core_2
>       oprofile: Implement Intel architectural perfmon support
>       oprofile: discover counters for op ppro too

Thanks Andi,

I applied your patches to the x86-oprofile-for-tip branch of
git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile.git

I added a follow on patch (446223f) on branch arch-perfmon that
changes the initialization so that it uses the init function in
op_x86_model_spec (see below). Please give it a try, it is compile
tested only. If it works for you, I will add it to the tip branch too.

There is one question to patch "oprofile: discover counters for op
ppro too". arch_perfmon_setup_counters() is actually never called for
ppro, so there is no code that changes the numbers in
op_ppro_spec. The patch as it is has no effect (except then loading
additional module code).

Thanks,

-Robert

commit 446223f8d1454e647b54160584c5dec8f83fdddc
Author: Robert Richter <robert.richter@....com>
Date:   Sun Oct 12 15:12:34 2008 -0400

    x86/oprofile: moving arch perfmon counter setup to op_x86_model_spec.init
    
    Cc: Andi Kleen <ak@...ux.intel.com>
    Signed-off-by: Robert Richter <robert.richter@....com>

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 12d6f85..fd902b8 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -435,7 +435,6 @@ static int __init arch_perfmon_init(char **cpu_type)
                return 0;
        *cpu_type = "i386/arch_perfmon";
        model = &op_arch_perfmon_spec;
-       arch_perfmon_setup_counters();
        return 1;
 }
 
diff --git a/arch/x86/oprofile/op_model_ppro.c b/arch/x86/oprofile/op_model_ppro.c
index f5a2268..3266795 100644
--- a/arch/x86/oprofile/op_model_ppro.c
+++ b/arch/x86/oprofile/op_model_ppro.c
@@ -220,7 +220,7 @@ struct op_x86_model_spec op_ppro_spec = {
  * the specific CPU.
  */
 
-void arch_perfmon_setup_counters(void)
+static int arch_perfmon_setup_counters(struct oprofile_operations *ignore)
 {
        union cpuid10_eax eax;
 
@@ -240,9 +240,12 @@ void arch_perfmon_setup_counters(void)
        op_arch_perfmon_spec.num_controls = num_counters;
        op_ppro_spec.num_counters = num_counters;
        op_ppro_spec.num_controls = num_counters;
+
+       return 0;
 }
 
 struct op_x86_model_spec op_arch_perfmon_spec = {
+       .init = &arch_perfmon_setup_counters,
        /* num_counters/num_controls filled in at runtime */
        .fill_in_addresses = &ppro_fill_in_addresses,
        /* user space does the cpuid check for available events */
diff --git a/arch/x86/oprofile/op_x86_model.h b/arch/x86/oprofile/op_x86_model.h
index 596de7a..418c2d0 100644
--- a/arch/x86/oprofile/op_x86_model.h
+++ b/arch/x86/oprofile/op_x86_model.h
@@ -51,6 +51,4 @@ extern struct op_x86_model_spec const op_p4_ht2_spec;
 extern struct op_x86_model_spec const op_amd_spec;
 extern struct op_x86_model_spec op_arch_perfmon_spec;
 
-extern void arch_perfmon_setup_counters(void);
-
 #endif /* OP_X86_MODEL_H */


-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com

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